‘The incident took place within a communal area of a block of flats in Charlotte Despard Avenue.

‘Detectives from the Homicide and Major Crime Command are investigating and ask anyone with information that could assist their enquiries to call the incident room.’

A witness who wished to remain anonymous said: ‘The first floor is used for drug dealing. Police know it happens every single day.

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‘He was on his back in his boxers and police were trying to resuscitate him.

‘He’s obviously been stabbed in his neck and the head. There was blood everywhere.

Lorna, the victim’s aunt and a friend comforted his brother Marvin (Picture: SWNS)

‘I would personally blame the people who are fully aware of what’s going on.

‘Wandsworth Council are not ignorant of the fact that this drug dealing situation has been happening.’

Ian was described by neighbours as the ‘loveliest, kindest guy’, on Thursday.

A woman, who wanted to remain anonymous, added: ‘He was a devoted dad.’

She continued: ‘Ian was very against the drug dealers right where he was murdered on that first floor landing and especially the antisocial behaviour when he had his children with him – noise up to four of five in the morning.

‘The police haven’t been able to tackle the rise of drugs on this estate.

A large police cordon remains at the scene (Picture: SWNS)

‘I’m absolutely terrified. He was a young, strong really lovely black guy who was the nicest kindest person and he was really muscular.